When estimating sample sizes for analyses involving CMS claims data, it is important to consider subtracting the NHANES-CMS linked participants enrolled in Medicare Part C. Medicare Part C plans are also referred to as Medicare Advantage (MA) and include Health Maintenance Organizations (HMOs), Managed Care Plans, Preferred Provider Organizations (PPOs), Private Fee-for-Service (PFFS) Plans, Special Needs Plans, and Medicare Medical Savings Account Plans. CMS generally does not receive claims data for Medicare beneficiaries who enroll in Medicare Part C. If your research project includes analyzing claims data you should consider subtracting the number of Medicare Part C enrollees from your estimated sample sizes calculated in task 2. This task will provide information on how to locate the table to estimate the number of NHANES-CMS linked participants enrolled in Medicare Part C plans.